Which of the following is the correct formula for calculating the direct group relations of 'span of control' as given by VA Graicunas?

A. $$r = n\left( {\frac{{{2^n}}}{n} + \left( {n - 1} \right)} \right)$$

B. $$r = n\left( {\frac{{{2^n}}}{n} - \left( {n + 1} \right)} \right)$$

C. $$r = n\left( {\frac{{{2^n}}}{n} - 1} \right)$$

D. $$r = n\left( {\frac{{{2^n}}}{n} + 1} \right)$$

Answer: Option A